首页
登录
学历类
Light travels at a speed which is about
Light travels at a speed which is about
题库
2022-08-02
48
问题
Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,000 km. But sound travels only 344m. You can get some idea of his difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke comes from his gun before the sound reaches your ears. This great speed of light gives us some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light left the moon 1.3 seconds before it reached you. The nearest star is so far away that the light which you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km per minute. In some case, the light from one of tonight's stars started on its journey to you before you were born. Thus, if you want to be honest, you can say "The stars are shining to night?" You have to say“The stars look pretty. They were shining four years ago but their light has just reached Earth. "We can know from the information given in the passage that the moon must be about ____ away from us.( )A. one million km B. 350,000 km C. 300,000 km D. 400,000 km
选项
A. one million km
B. 350,000 km
C. 300,000 km
D. 400,000 km
答案
D
解析
从文章“light travels about 300,000km”和“the light left the moon 1.3 seconds before it reached you.”中可知,根据计算300,000×1.3≈400,000。
转载请注明原文地址:https://tihaiku.com/xueli/2664615.html
本试题收录于:
高起本和高起专英语题库高起本高起专成考分类
高起本和高起专英语
高起本高起专成考
相关试题推荐
Lighttravelsataspeedwhichisabout
Lighttravelsataspeedwhichisabout
Lighttravelsataspeedwhichisabout
Lighttravelsataspeedwhichisabout
随机试题
[originaltext]M:Yeah,youmentionedAmericanizedstyle.Whatisparticularabo
Directions:Forthispart,youareallowed30minutestowriteashortessayent
下列关于震级与烈度的关系叙述错误的有()。A:一次地震只有一次震级 B:一次
患者,35岁,1个月前右膝被铁锹把撞伤,此后即感局部疼痛,来院检查,右胫骨上端轻
人体速度素质发展的敏感期是( )。A.8~9岁 B.9~13岁 C.13~
A.调节全身阴经经气 B.涵蓄十二经气血 C.调节六阴经经气 D.调节肢体
下列各项目标中,属于宏观经济政策目标的有( )。[2011、2008年初级真题
中国进入社会主义初级阶段的最主要标志是A.社会主义改造的基本完成 B.中华人民
(2015年真题)下列流水施工参数中,属于空间参数的是()。A.施工过程和
【教材已删除】工程风险管理计划实施过程中的监控内容包括()。A.制订风险控
最新回复
(
0
)